Hypodermic syringe



-Ocp 9, `19.28.

` 1,687,324 H. S. COOK HYPODERMIC SYRINGE Filed Feb. 2s, 1925 v lllnlllllllllllllllll Patented Oct. 9, 1928A.

UNITED STATES PATENT OFFICE.

.HARVEY S. COOK, 0F VALPARAISO, INDIANA, .ASSIGNOR TO COOK LABORATORIES, INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

HYPODERMIC SYRINGE.

Application led February 26, 1925. SerialfNo. 11,707.

This invention relates to hypodermic syringes and aims generally to provide an 1mproved syringe of the cartridge type exemplied in Patent No. 1,231,497, granted to me June 26, 1917.

The invention vmay be understood by reference toA one illustrative embodimentshown in the accompanying drawings, in which:

Fig. 1 is an elevation of thesyrmge, showing the plunger in extended position;

Fig. 2 is an enlarged longitudinal section of the same, showing the plunger at the start of the medicament-dispensing stroke;

Fig. 3 is a similar view, with parts in elevation, showing the plunger, at the end of its stroke; 'U l Fig. 4 is an enlarged longitudinal sectlon through the syringe needle; and Y Fig. 5 is an elevation of the medicament package.

' Referring to Figs. 1 and 2, the syringe shown comprises a barrel 6 `constituting a cartridge holder; and a medica-ment conduit extending from the interlor of the b arrel to the point of injection, herein provided by j a double-pointed hypodermic needle 8. The

medicament-containing component of the syringe comprises a Sealed package 0r cart1idge, which may contain a sterile charge of definite volume; and this, pagkag'e is so constructed and arranged that 1t may be carried within the'barrel chamber and be collapsed or have its interior volume reduced by means of the plunger,'thereby expelling lthe medicament when theneedle is in communication with its interior.

As shown, the medicament-dispensing package is made from a tube 9, preferably commercial glass tubing cut to the desired length, and sealed at opposite ends by rubber plugs 10, at least one of which has an 1n- `Wardly-opening axial cavity 11, or in other words is cup-shaped. This package is insertible into the barrel, which as shown may have one end 12 open foi' that purpose; and 1t 1s secured by the barrel head 13 removably held on the barrel end 12 by a double-bayonet joint 14, Fig. 1. 'At the opposite end of the barrel, there is a bore 15 for the plunger '7 whose outer end is enlarged as at 16 to provide a knob co-operating with finger grips 17, so that the plunger may be slid into the barrel to ush the adjacent plug 10 through the tube 9, tlhereby dispensing the medicament.

and during an injection, the needle 8 may be held immovably by clamping between the two halves of a. split screw-threaded neck or extension 18 projecting outwardly from the barrel head 13. The screw-threaded eXtension 18 mayta-per as shown, and is contracted by means of a tapered nut 19 screwed upon the extension. To increase the resiliency of the split extension, aI small lateral bore 20 is provided -at the inner end of the split.'

`As the dispensing operation slides one of the plugs toward the other, it is desirable that the inner end of the needle project a minimum distance beyond the inner .(cupped) face of the plug through which it passes, so that the sliding plug may not be thrust by the plun r against the needle end, thereby sealing it fore ejection of substantially all the fluid, as

will be understood fromv Fig. 3. To preventv this action, the needle 8 atan intermediate point has anenlargement 21 secured in'any desirable way thereon, for example by swaging, as shown in Fig. 4, and providing a stop. This enlargement may have any form, provided it be easily grasped by the fingers without liability of needle contamination. In practice, such a needle will be carried in a sealed, aseptic envelope or container until immediately before use, and may then be secured to the barrel head, which -provides a convenient needle handle during the piercing. operation. An' alternative procedure is to pass the needle through the nut 19, screw the ylatter loosely on the extension 18, -push the needle through the plug, and then tighten the nut to secure the needle. If, however, the length of the medicament package is materially less than the chamber provided for it, within the barrel, the plug may not be pierced by the needle even when properly positioned.-

In such cases, the reaction :fromy the sliding resistance of the plungerfpushed plug thrusts the package asa whole against 4the inner end of the secured needle, .which thereupon pierces the adjacent plug. f l

To hold the plunger in either the extended osition of Fig. 1 or in the position of Fig. 3,

To put the needle in communication with atching means is provided in the form of a sprin tongue or tongues 22 struck out from Y and having a bent extremity 23 shaped to lit the annular grooves 24, one of which is preferably adjacent the knob 16. Thus the plunger may only be Withdrawn from the syringe by a deliberate movement. As the barrel is usually of opaque material, such as metal, for obvious reasons, the contents of the medicament package are hidden during an injection; and therefore a scale 25 is marked on the plunger, enabling the practitioner accurately to proportion the dose according to conditions. f Under certain arrangements of the parts of the syringe, or When using considerable force in expelling the medicament, the plunger may force the needle entirely through both plugs and break the needle, to prevent Which the inner plunger end has an axial bore 26. p

The cartridge or medicament package herein shown, and a syringe organization embodying the same as an operative component, are the subjects-matter of and broadly and specically claimed by me in my' co-pending application filed July 1, 1921, ISerial No. 481,- 997; hence I make no claim therefor in this application apart from particular features or combinations of the present invention as set forth in claims.

Thisy application is in part a continuation of my application filed April 8, 1921, Serial No. 459,6801/2, and is inl part based upon the original disclosure thereof and in part based upon an organization comprising the cartridge shown in said co-pending application Serial No. 481,997 in assembly with the instrument shwn in 'said application Serial No. 459,6801/2.

What is claimed is':

1. A hypodermic syringe comprising, inv

combination, a barrel providing a chamber, said chamber being adapted to receive a package of medicament sealed with a closure; a barrel head closing the chamber and forming an abutment for the endof thepackage; a needle holder on the head; a plunger slidable into the barrel; co-operatin means on the barrel and plunger for holdmg the plunger against accidental displacement; a needle held by and passing through the barrel so as to project into the chamber and penetrate one of the closures; and a stop on the needle to determine automatically the position of the needle end Within the package relative tothe closure penetrated by it.

2. A hypodermicsyringe comprising, in combination, a barrel providing a chamber; a package of medicament having an opening and insertible into said chamber; a recessed closure sealing said opening; a barrel head at one end of the chamber and providing a needle holder; a plunger movable into the barrel; a needle held 'upon the barrel head'so las to project into the chamber and penetrate the closure; and a stop on the needle to determine automatically the position of the needle package relative to therecess structed to receive a medicament package,

and the other end adapted to receive a plunger; a plunger slidable therein; an enlarged knob on said plunger; the plunger having an annular groove adjacent the knob thereof; and a spring secured to the barrel and constructed and arranged to engage in said groove to hold the plunger Within the barrel. t

4l. A hypodermic syringe comprising, in combination, a medicament package constructed 'and arranged to have its interior volume reduced for expelling of its contents; a barrel constructed and arranged to receive said package; needle securing means at one end of the barrel; a needle having an enlargement thereon; said medicament package having an opening; a resilient plug closing said opening and of reduced thickness axially to providel a cup-like recess facilitating axial piercing thereof by the needle; the needle enlargement positioning the inner point of the needle relative to the discharge end of the package. v

5. A hypodermic syringe comprising, in combination, a medicament package constructed and arranged tofhave its interior volume reduced for expelling of its contents; a barrel constructed and arranged to receive .said package; a needle having an enlargement thereon ;'said medicament package having an opening; a resilient plug closing said vopening and of reduced thickness axially to i provide a cup-like 4recess facilitating axial piercing thereof bythe needle; the needle enlargement positioning the inner point of the needle so that it lies substantially Within the of which is of reduced axial thickness for'- v easy piercing by the needle, the other ofv which may be pushed by the syringe plunger for dispensing of the medicament throu h the needle; and'means forming a part of t 1e syringefor holding the package and needle in operative positions.

comprising, inJcombination, a syringe body f member constructed and arranged for insertion of a medicament-dispensing package; a

removable head closing one end 'of said body 13 l '7.'An instrument of the class described memberand having an axial recess open `at its inner end, and a fine axial bore at its outer end in communication with said recess; a double-pointed hypodermic needle having an intermediate vstop thereon, the inner branch of said needlebeing entered through said line axial bore and axially of saidrecess Iand adapted to pierce through a pierceable stopper in the fore end of said package; said head embodyingmeans securing said needle in place; and a syringe plunger for operating on said package to expel its fluid contents through the needle.

8. A hypodermic .syringe comprising, in combination, a cartridge embodying a rigid through the canula, said plunger being axially recessed to protect the inner end of the canula if during the medicament-expel- 25 ling operation it should pierce'through both ofsaid resilient Stoppers. f

In testimony whereof, I have signed my name Ato this specification.

HARVEY S. COOK. 

